Theoretical Models for Bump Cepheids

Theoretical models for classical Cepheids V. Multiwavelength relations

From a theoretical study based on nonlinear, nonlocal and time-dependent convective pulsating models at varying mass and chemical composition, we present the predicted Period-Luminosity, Period-Color, Color-Color and PeriodLuminosity-Color relations in the BV RIJK bands for Classical Cepheids. All the theoretical relations are, in various degrees, metallicity dependent and the comparison with o...

Bump Cepheids and the Stellar Mass-Luminosity Relation

We present the results of non-linear pulsation modeling of bump Cepheids in the LMC and SMC. By obtaining an optimal fit to the observed MACHO V and R lightcurves we can determine the fundamental parameters of each Cepheid, namely mass, luminosity, effective temperature, distance modulus and reddening. We are able to describe the mass-luminosity relation for core-He burning intermediate mass st...

Experimental Envelope Models for Cepheids

Theoretical Models for Classical Cepheids : II . Period - Luminosity , Period - Color and Period - Luminosity - Color Relations

We present and discuss theoretical predictions concerning the pulsational properties of Classical Cepheids. Masses and luminosities provided by stellar evolutionary calculations are used as input parameters of nonlinear, nonlocal and time–dependent convective pulsating models and accurate determinations of both the blue and red edge of the instability strip are derived, together with theoretica...

Theoretical models for classical Cepheids VII. Metallicity effects on the Cepheid distance scale

We use theoretical Period-Luminosity and Period-Luminosity-Color relations in the V I passbands, as based on nonlinear, nonlocal and time-dependent convective pulsating models, to predict the reddening and true distance modulus of distant Cepheids observed with the Hubble Space Telescope. By relying on the pulsating models with metal content Z=0.008, we find that the theoretical predictions agr...